OBJECTIVE Percutaneous cochlear implant surgery consists of a single drill path from the lateral mastoid cortex to the cochlea via the facial recess. We sought to clinically validate this technique in patients undergoing traditional cochlear implant surgery. STUDY DESIGN Prospective clinical trial. METHODS After institutional regulatory board-approved protocols, five ears were studied via t...

BACKGROUND Dacrocystorhinostomy (DCR) is an operation used to treat nasolacrimal duct obstruction. Essentially there are two approaches: external and endoscopic. Several modalities are used in endoscopic DCR; all aiming to improve success rate, reduce complications, and shorten operative time. Both kerrison punch and drill are widely used in endoscopic DCR with non-conclusive knowledge about di...

Rotary friction welding (RFW) is used in the production of drill pipes for solid mineral prospecting. The need creation lightened strings high-speed diamond drilling ultradeep wells dictates necessity a greater focus on study weld zone and setting RFW technological parameters. This paper presents results experimental studies welded joint pipe H standard size according to ISO 10097, made 30ХГСА ...

The functioning of the first type, the flue or labial pipe, was already investigated within previous extensive research projects. The second pipe type, the reed pipe, is less often installed in pipe organs, and only little research was done in this field so far. This is why this pipe type is now the focus of research of the working group ‚Musical Acoustics ‘ at the Fraunhofer Institute for Buil...

As an important drilling tool, the landing string will be directly exposed to seawater during surface riserless operations, and it undergo complex deformation under action of environmental loads such as ocean currents waves displacement, heave vibration platform. At same time, with increase in water depth, floating weight drill pipe casing also increases significantly, bear great tensile loads,...

The measurement while drilling (MWD) system in underground coal mine currently uses wire for signal transmission. However, it has shortcomings such as strict technical requirements cable drill pipe processing and high cost of use. Electromagnetic (EM-MWD) is a new technology rate information transmission with fast speed low not affected by the media. Hence, necessary to investigate reliable ele...

OBJECTIVES To compare the noise and vibration levels associated with three hand-held rock drills (pneumatic, hydraulic and electric) currently used in South African mines, and a prototype acoustically shielded self-propelled rock drill. METHODS Equivalent A-weighted sound pressure levels were recorded on a geometrical grid, using Rion NL-11 and NL-14 sound level meters. Vibration measurements...

The fast monitoring of tool wears by using various Cutting signals and the prediction models developed rapidly in recent years. Comparatively, various wear forecast models based on artificial neural networks (ANN) perform much better in accuracy and speediness than the conventional prediction models. Combining the prominent dynamic properties of back propagation neural network (BPNN) with the e...

OBJECTIVES The purpose was to assess thermal changes and drill wear in bovine bone tissue with the use of twisted stainless steel and zirconia-based drills, during implant site preparation. METHODS A total of 100 implant site preparations were performed on bovine ribs using a surgical unit linked to a testing device, in order to standardize/simulate implant drilling procedures. Bone temperatu...